--- title: "Semax/Selank Blend vs Semax: Side-by-Side Comparison (2026)" url: https://www.bodyhackguide.co/compare/semax-selank-blend-vs-semax description: "Compare Semax/Selank Blend vs Semax side by side. We earn a commission on some vendor links. Mechanism, half-life, dose range, side effects and prices." lang: en --- Skip to content Compare notes on r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Compare notes with other researchers. Join r/BodyHackGuide (https://reddit.com/r/bodyhackguide) # Semax/Selank Blend vs Semax Side-by-side comparison of Semax/Selank Blend and Semax: mechanism, half-life, dose range, safety profile, and vendor pricing. Semax/Selank Blend from $74.99 Semax from $32.90 ## Price snapshot ### Semax/Selank Blend Current low $74.99 current listings 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ### Semax Current low $32.90 current listings 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ## Semax/Selank Blend Combined nootropic and anxiolytic peptide blend **Lowest listed price:** $74.99 across 3 listings Full Semax/Selank Blend profile (https://www.bodyhackguide.co/compound/semax-selank-blend) ## Semax Semax is a synthetic heptapeptide (Met-Glu-His-Phe-Pro-Gly-Pro, MEHFPGP, 813 Da molecular weight) developed at the Institute of Molecular Genetics of the Russian Academy of Sciences in the 1980s. The compound is derived… **Lowest listed price:** $32.90 across 5 listings Full Semax profile (https://www.bodyhackguide.co/compound/semax) ## Side-by-side comparison | Attribute | Semax/Selank Blend | Semax | | --- | --- | --- | | Category | Nootropics | Nootropics | | Research Stage | Preclinical (no trials on the blend; components studied separately, mostly in Russia) | Approved (Russia, since mid-1990s for stroke and cognitive disorders) | | Mechanism of Action | The Semax/Selank blend combines two synthetic Russian-developed regulatory heptapeptides, dosed together (usually intranasally) to pair an activating, pro-cognitive peptide with a calming, anxiolytic one. Because the blend itself has never been studied, its… | Primary Mechanism: Multi-Pathway Neurotrophic Activation Semax produces its effects through coordinated activation of multiple neurotrophic, neurotransmitter, and neuroprotective pathways. Unlike conventional nootropics that target a single system (modafinil… | | Half-Life | Both component peptides have short plasma half-lives (on the order of minutes) but a prolonged duration of central action, attributed to the protective C-terminal Pro-Gly-Pro sequence they share. Blend-specific pharmacokinetics have not been characterized. | ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes) | | Typical Dose Range | Semax ~250-600 mcg + Selank ~250-300 mcg per day, intranasal (community-reported; no established blend dose) | 100-900 mcg intranasal daily (0.1% solution: 2-3 drops per nostril 2-3x daily); 1% solution used for acute stroke in Russian clinical protocols | | Dosing Frequency | Once or twice daily, intranasal (community practice; no validated schedule for the blend) | Intranasal 1–3 times daily | | Administration | — | Intranasal | | Side Effects | Reported side effects are drawn from single-component use, since the blend itself has not been studied. Intranasal administration can cause nasal or throat irritation and mild headache. The Semax component may, at higher doses, cause over-stimulation,… | Overall Safety Profile Semax has an excellent safety profile across 20+ years of Russian clinical use. In acute stroke trials, cognitive studies, and pediatric applications, Semax has demonstrated consistent tolerability with minimal adverse event burden. This… | | Molecular Weight | — | 813.9 Da | | Common Vial Sizes | — | 5mg, 10mg | ## Price History 2 data points - Half Nattys - Disguised Alpha ## Price History 5 data points - OF - Half Nattys - Ion Peptide - BHG Labs ### Semax/Selank Blend: potential benefits - Focus, clarity, and verbal fluency attributed to the Semax component (linked to BDNF/TrkB neurotrophic signaling in preclinical studies) - Calming, anti-anxiety effects attributed to the Selank component (a GABA-modulating, anxiolytic peptide in animal and limited clinical studies) - 'Calm focus' - the community rationale of pairing an activating peptide with an anxiolytic one to get drive without jitters - Anecdotal stress resilience and mood support - Reported memory and learning support (component-level preclinical signals only; not demonstrated for the blend) ### Semax: potential benefits - Rapid BDNF/TrkB upregulation in the hippocampus, supporting synaptic plasticity and learning (PMID: 16996037) - Neuroprotective, immunomodulatory gene-expression changes in focal cerebral ischemia (middle cerebral artery occlusion) models (PMID: 28255762) - Cognitive enhancement including improved attention, working memory, and processing speed - Dopaminergic modulation that may support motivation and executive function (preclinical data) - Stroke recovery facilitation - accelerated functional recovery and improved Barthel Index in ischemic stroke patients; approved in Russia for ischemic stroke (PMID: 29798983) - Anxiolytic and anti-asthenic effects reported in Russian clinical use, attributed to neurotrophic and monoaminergic modulation - Non-addictive cognitive support without tolerance development or withdrawal at standard doses ## Frequently asked ### What's the difference between Semax/Selank Blend and Semax? Semax/Selank Blend is a nootropics that the semax/selank blend combines two synthetic russian-developed regulatory heptapeptides, dosed together (usually intranasally) to pair an activating, pro-cognitive peptide with a…. Semax is a nootropics that primary mechanism: multi-pathway neurotrophic activation semax produces its effects through coordinated activation of multiple neurotrophic, neurotransmitter, and neuroprotective…. The two differ in mechanism, half-life (Both component peptides have short plasma half-lives (on the order of minutes) but a prolonged duration of central action, attributed to the protective C-terminal Pro-Gly-Pro sequence they share. Blend-specific pharmacokinetics have not been characterized. vs ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes)), and typical dose range. ### Which has the longer half-life, Semax/Selank Blend or Semax? Semax/Selank Blend has a half-life of Both component peptides have short plasma half-lives (on the order of minutes) but a prolonged duration of central action, attributed to the protective C-terminal Pro-Gly-Pro sequence they share. Blend-specific pharmacokinetics have not been characterized.. Semax has a half-life of ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes). Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Which is cheaper, Semax/Selank Blend or Semax? Lowest listed price on BodyHackGuide: Semax/Selank Blend from $74.99, Semax from $32.90. Prices are pulled from the vendor listings tracked on BHG and change frequently. See the compare tables on each compound page for the current set of offers. ### Can you stack Semax/Selank Blend and Semax? Stacking depends on mechanism overlap, safety profile, and goals. Semax/Selank Blend and Semax should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds. ## See current vendor prices Listings from the vendors we track. Prices change often, so check the vendor before you buy. Semax/Selank Blend prices: https://www.bodyhackguide.co/compound/semax-selank-blend?tab=prices Semax prices: https://www.bodyhackguide.co/compound/semax?tab=prices Compare all compounds: https://www.bodyhackguide.co/compare ### Before you buy Semax/Selank Blend or Semax Check the vendor trust score. Every supplier we track is rated 0-100 on COA verification, payment transparency, shipping, reviews, and listings: one published, reproducible methodology, applied to every vendor. View Vendor Scorecard (https://www.bodyhackguide.co/vendors/scorecard) ## Related comparisons Selank vs Semax: https://www.bodyhackguide.co/compare/selank-vs-semax **Research use only.** BodyHackGuide is a research and price-comparison reference. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. See editorial standards (https://www.bodyhackguide.co/editorial-standards) and affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). 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